#!/bin/sh
# desc: setup linux system security
# author:coralzd
# powered by www.freebsdsystem.org
# version 0.1.2 written by 2011.05.03
# http://os.51cto.com/art/201107/273839.htm

#设置账号
passwd -l xfs
passwd -l news
passwd -l nscd
passwd -l dbus
passwd -l vcsa
passwd -l games
passwd -l nobody
passwd -l avahi
passwd -l haldaemon
passwd -l gopher
passwd -l ftp
passwd -l mailnull
passwd -l pcap
passwd -l mail
passwd -l shutdown
passwd -l halt
passwd -l uucp
passwd -l operator
passwd -l sync
passwd -l adm
passwd -l lp

# 用chattr给用户路径更改属性。chattr命令用法参考文末说明[1]
chattr +i /etc/passwd
chattr +i /etc/shadow
chattr +i /etc/group
chattr +i /etc/gshadow

# 设置密码连续输错3次后锁定5分钟
sed -i 's#auth        required      pam_env.so#auth        required      pam_env.so\nauth       required       pam_tally.so  onerr=fail deny=3 unlock_time=300\nauth           required     /lib/security/$ISA/pam_tally.so onerr=fail deny=3 unlock_time=300#' /etc/pam.d/system-auth

# 5分钟后自动登出，原因参考文末说明[2]
echo "TMOUT=300" >>/etc/profile

# 历史命令记录数设定为10条
sed -i "s/HISTSIZE=1000/HISTSIZE=10/" /etc/profile

# 让以上针对 /etc/profile 的改动立即生效
source /etc/profile

# 在 /etc/sysctl.conf 中启用 syncookie
echo "net.ipv4.tcp_syncookies=1" >> /etc/sysctl.conf
sysctl -p # exec sysctl.conf enable

# 优化 sshd_config
sed -i "s/#MaxAuthTries 6/MaxAuthTries 6/" /etc/ssh/sshd_config
sed -i  "s/#UseDNS yes/UseDNS no/" /etc/ssh/sshd_config

# 限制重要命令的权限
chmod 700 /bin/ping
chmod 700 /usr/bin/finger
chmod 700 /usr/bin/who
chmod 700 /usr/bin/w
chmod 700 /usr/bin/locate
chmod 700 /usr/bin/whereis
chmod 700 /sbin/ifconfig
chmod 700 /usr/bin/pico
chmod 700 /bin/vi
chmod 700 /usr/bin/which
chmod 700 /usr/bin/gcc
chmod 700 /usr/bin/make
chmod 700 /bin/rpm

# 历史安全
chattr +a /root/.bash_history
chattr +i /root/.bash_history

# 给重要命令写 md5
cat > list << "EOF" &&
/bin/ping
/usr/bin/finger
/usr/bin/who
/usr/bin/w
/usr/bin/locate
/usr/bin/whereis
/sbin/ifconfig
/bin/vi
/usr/bin/vim
/usr/bin/which
/usr/bin/gcc
/usr/bin/make
/bin/rpm
EOF

for i in `cat list`
do
   if [ ! -x $i ];then
   echo "$i not found,no md5sum!"
  else
   md5sum $i >> /var/log/`hostname`.log
  fi
done
rm -f list
